A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the gyro compass room between 65 and 68 stations below the main flat, looking towards the aft port corner showing the gyro compass amplifier unit with the gyro compass power distribution panel below and a fuse box above on the port bulkhead. To the right of these units is a cupboard unit, labelled cupboard one and cupboard two, with an ashtray mounted on the door. The compass retransmission unit is on the left with two gyro compass control units and a gyro compass alarm unit next to it. A vertical format negative.